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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0eccbc917f3802ecb6b51ec6419d99402ac2f7554167275bf192aae078859a' 
  AND token = 'JSEi4ZopG26+3u7Bi5hEYy36oVItMEdFy90CD9eyREg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}